Apparatus for transmitting recording graphics



March 28, 1939. G. DELCHEF 2,151,750

APPARATUS FOR TRANSMITTING RECORDTNG GRAPHICS Filed June 22, 1935 4 Sheets-Shea"- l INVENTOR GEORGES DE'LCHEF BY 264:2 M

ATroR EY March 28, 1939. G. DELCHEF 2,151,750

APPARATUS FOR TRANSMITTING RECORDTNG GRAPHTGS Filed June 22, 1935 4 Sheets Sheet 2 L8L L H. I O

//v VENTOR GE ORGES DEL CHEF BY xa w A TTORNE. Y

G. DELCHEF 2,151,750

APPARATUS FOR TRANSMITTING RECORDING GRAPHICS March 28, 1939.

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ATTORNEY March 28, 1939. v G. |5ELHEF' 2,151,750

APPARATUS FOR TRANSMITTING RECORDING GRAPHICS Filed June 22, 1935 4 Sheets-Sheet 4 INVENTOR GEORGES DELCHEF ATTORNEY Patented Mar. 28, 1 939 PATENT OFFICE APPARATUS FOR TRANSMITTING RECORDING GRAPHICS Georges Delchef, Brussels, Belgium Application June 22, 1935, Serial No. 27,898 In Belgium June 22, ,1934

8 Claims.

My present invention relates to an apparatus for transmitting recording graphics, of the kind in which electric contact pieces synchronically travel in relation-,to two surfaces, the one transmitting and the other receiving the graphics or messages.

It more especially concerns an apparatus in which a contact member displaces itself according to the generatrix of a drum or practically so,

the startings of this contact member being made synchronous on the transmitting device on the one hand and on the receiving device on the other hand.

In such an apparatus, the transmission of messages is only possible in one direction of movement; the return of the contact member taking place (rapidly) in a length of time always under a given time, so that the contact members may be able to resume their former position previous to going over another line, the drum (of transmission on the one hand and of reception 'on the other hand) being subjected meantime to a slight rotation.

This method allows of a transmission notwithstanding a difference of speed between the driving members of the transmitting device and of the receiving device and permits the use of a receiving band which is not limited in dimensions to the surface of the carrying drum.

My present invention has for its object to provide an apparatus reliable in its working, in-

volving the use of no complicated parts namely for the synchronization, and in which the passing from the transmitting position to the receiving position is particularly simple.

With this object in View, my invention essentially consists inthe special arrangements of parts hereinafter fully described and pointed out in the appended claims.

The attached drawings show one form of the apparatus by way of example.

.Figure l is a plan view showing the arrangement of the apparatus.

Figures 2 and 3 are detailed views showing the arrangement of the transmission and receiving surfaces.

Figures 4 to '7 are views in detail.

Figure 8 shows a diagram of the circuit arrangements.

Figures 9 and 1 show modifications of the embodiment.

In the example shown, the apparatus represented in Figure 1 consists of a base carrying at one end a rectangular container formed by plates 2, 3, 4 and 5. The base I carries a motor 1 provided with a centrifugal brake 8 on the fly-wheel of which is mounted a device l0 which if desired can be employed to convert the transmitting current from continuous to alternating.

The motor drives a shaft 9 which carries a worm engaging with a worm wheel |2 mounted on a shaft |3.. The latter carries'at one end a coupling electromagnet l4 and atthe other end a toothed pinion I5 which engages with a toothed wheel l8, which carries a cam H and a pin i8. 10 This pin I8 co-operates with a lever which oscillates about an axis 2| (Figure 5) and has a projection for operating the contacts |'03| 04.

The cam actuates a-lever I9 (Figure 6) furnished with a pawl 23 arranged to act on a 5 ratchet wheel 24. This ratchet wheel has a smooth part furnished with a notch 25 and carries a pin 26 arranged to operate a lever 21 incorporating a plate 28 to which it is electrically connected. This lever 21 has anextension at the end in contact with the pin 26 consisting of a blade 21 provided with a projection 21 by means of which it can act on a lever 78 the function of which will be explained later. At the opposite end the lever 21 has an extension 28 provided with contact members I01 adapted to engage either with contacts I08 or contacts I08 according to the position of the lever. The notch 25 serves to receive a pin 29 forming part of the armature 30 of an electromagnet 3|. As shown 30 in Fig. 6 when the armature 30 is in the energized position contacts ml and I82 are closed.

Facing the electromagnet I4 is a pulley 32 (Figure 1) which is mounted on a shaft 33 carrying a helix 34 arranged to move the rods 35 and 35 36 by means of the pins or blocks 35' and36.

The rod 35 has only for its function to guide the whole constituted by the rod 35, the helix 34 and the blocks 35, 36.

The shaft 33 carries at its end a spring 31 which presses on the one hand on a ball-bearing abutment 38 and on the other hand on a plate 39. The end of the shaft 33 rests in contact with the end of a screw 40. Under the electromagnet l4 and the pulley 32 is a block 4| mounted on guide rods 44 and 45 and which can be displaced by the manual operation of a push button 42 which is situated at the end of a rod 43 fixed to the block. The block 4| can be operated only manually against the action of springs 4| and. is held in the operated position by the lever 18 which enters a notch in the rod 43. When this lever is tilted under the action of the lever 28 (Fig. 6) the block 4| is freed and returned to its normal position by the springs 4|. The block 4| carries a plate 45 pivoted as shown in Figure 4 and carrying a lever having a vertical arm 41 and a horizontal arm 40 (Figure 1). The lever 41-48 is adapted to be tilted under control of the rod 35 so that it acts either on a lever 49 or on a lever 50, which are both mounted freely on a shaft 5|. The lever 50 acts by means of a pawl 52 on a ratchet wheel 53 which is fixed on the shaft 5| carrying the receiving cylinder 55. The lever 48 acts by means of a pawl on a ratchet wheel 51' rigidly connected to the transmitting cylinder 55. Thus either the receiving cylinder or the transmitting cylinder is operated according to the position of the block II.

The assembly of the receiving and transmitting cylinders comprises (Figures 2 and 3) a fixed cylindrical portion 59 partly surrounding the receiving cylinder 58, The latter (if an electrolyte is used) consists of a cylinder about which is wrapped the sensitized receiving band of paper. A sleeve 50 serves to support the cylinder 58 and can permit of it being filled with the solution destined for the electrolysis.

The transmitting cylinder 55 comprises a section of a hollow cylinderhaving annular ends. A contact member, for example a small style GI, is carried by a movable support 62 to which is fixed a cord fixed on the one hand to the pulley 32 and on the other hand to the return pulley El The slide 52 moves along the transmission or reception cylinder being guided by wires 53 fixed on the one hand to screws 54 penetrating the plates and on the other hand to screws 55 fixed in a support 55 mounted on the base I, which also supports the cylinders. when the carriage 52 reaches the end of its traverse i. e. at the left hand posi-- tion in Fig. 1, a contact I00 is opened. This contact is not shown in Fig. 1 since its function is purely electrical but it is indicated in the circuit vpresses on the contact springswhich therefore make contact with the terminal contacts E2, E3, E4, E5 (condition for transmission).

The condition of contacts 3 serves to control certain circuits to be indicated later and which determine whether the apparatus is to be used for transmission or reception. In fact with the contacts in the condition shown in Fig. 4, i. e., with the knob 42 pressed in the apparatus is set for transmission. The release of the knob under the control oi. the lever 25 as described above conditions the apparatus for reception.

The rod 35 (Figure 1) acts at one end on a spring I3 (Figure 7) which is fixed to a. support 19', located at the rearof the apparatus and which carries two contacts I05 and I06 on opposite sides which co-operate with fixed contacts I05 and I05.

This spring is so arranged that when the contacts I05I05' are in the open position, the con- 'tacts I05-I05' are in the closed position and vice versa.

In the position shown in the drawings the pin 25 acts on the lever 21 whereby contacts I0I are contacts I "'50 that the electromagnet 3| is connected to the line over conductors 80. If the apparatus is required to transmit signals two manual operations must be performed. First; the knob 42 is pressed inwards to cause contacts 2, 3, 4 and 5 to engage with contacts E2, E3, E4 and E5 and second the armature 30 is lifted so that the pin 29 is removed from the slot 30 (Fig. 6). As a result of the second operation contact I 02 is closed and the motor M is energized over the circuit: +HT, conductor 84, 84, winding M of the motor, conductor 84, contact I02, -HT. A circuit is also closed for electromagnet I4 over: +HT, electromagnet I4, normally closed contact I00, resistance R5000, contact I02, HT. Due to resistanceR5000 the current in the circuit is insufilcient to cause the energlzation of the electromagnet. The motor, however, commences to rotate whereupon the pin 25 is moved away from the lever 21 and the electromagnet 3| is disconnected from the line L-L1 and connected to the anode circuit of the valve Tl. Further the pin I8 on the wheel I5 is gradually moved into contact with the arm 20 to cause the closing of contacts I03 and I04. Calling signals are now transmitted over the line due to the closing of the circuit: .9, contact I03, conductor 82, contacts 2, E2, conductor 02, I0, conductors 82 primary winding of transformer Tr, s. A source of low frequency alternating current is connected to ss' and serves as a calling signal. The closure of contact I04 short-circuits resistance R5000 over contacts E4, 4, conductor 88 and contact I04. Current is now sufiicient in the above-traced circuit for electrom-agnet I4 to allow the latter to operate. As a result armature 32 is attracted and the carriage 52 is set in motion.

At the other end of the line the calling signal passes over conductor 80, contacts I08 and I0'I to the winding of the electromagnet 3I.

The electromagnet 3I is thus energized through its first step to close contact I02 only so that the armature 30 takes up the position shown at b in Figure 6. Contact I02 thereupon closes a heating circuit for the valves TI and T2 as follows: +HT, conductor 84, resistance R600, filaments of valves T2 and TI in series, conductor 85, contacts RI, I, I02, HT. Further as pointed out above when the motor commences to rotate due to the closure of contacts I02 the electromagnet 3I is disconnected from the line L-L1 and is connected in parallel with the anode circuit of the valve TI. As in the case of the transmitting apparatus the closure of contact I02 also completes a circuit for electromagnet I4 but this does not operate due to the resistance R5000 which is included in the energizing circuit. However, as soon as anode current commences to flow electromagnet 3| is energized through its second step and takes up the position shown at c in Figure 6 whereupon contact IN is closed. Resistance R5000 is thereby short-circuited and the electromagnet I4 now operates over its energizing circuit and the carriage 52 at the receiving station commences to ad- Vance.

The anode potential of the valve T2 is obtained by a direct connection thereto from conductor 51 while the anode circuit of valve TI extends over: conductors 93 and 94, contacts R5, 5, receiving cylinder C, receiving paper, stylus 5|, conductor 92, contact I05, 3, R3, conductors 95, 84, +HT, contact I05 being closed on the commencement of rotation of the motor by the axial movement of the rod 35.

At thetransmitting station contact I05 is also closed on the movement of the motor and a circuit is then closed extending as follows: terminal s, transformer Tr, conductor 82, contacts E3, 3, contact I06, conductor 82, stylus 6|, transmitting paper, cylinder C, contacts 5, E5, conductor 9|, 9|, terminals. Picture currents,

therefore, flow over the transformer Tr and pass over the line L-L, to the receiving station where they are applied to the grid of the valve T2 over the circuit: filament of valve T2, conductors 83, 82, windingof transformer T1, conductor 83 to the grid. The anode current of the valve TI thus fluctuates in accordance with the incoming signals and since the anode circuit includes the stylus 6!, a trace is made on the receiving paper corresponding to that at thetransmitter.

When the carriages 62 at the transmitting and receiving stations reach the end of their traverse,

the respective rods 36 engage with the lever 41-48 to cause the stepping of the receiving and transmitting cylinders as described above. Further contacts I00 are opened to cause the deenergization of electromagnets' I4 whereby the motor is decoupled from the driving mechanism and thecarriages 62 move back to their starting positions under spring tension. Contacts I00 are again closed and the electromagnets I4 are again energized and the cycle of operations recommences. It will-be understood that the armature 30 of the electromagnet 3L is maintained in position at the transmitter due to the fact that the pin 29 is riding on the periphery of the wheel 24, the letter making one revolution while a complete picture is transmitted, while at the receiver the electromagnet 3| is maintained energized in its second step by the anode current from valve Tl. At the termination of transmission and reception contacts I01, and I08" are separated and the pin 29 comes into alignment with the slot in the wheel 24 so that electromagnet 3| is returned to normal at both stations, the motors stop and the transmitting station is returned to its normal condition of reception.

In the case where the line L-L1 is a telephone line it may be necessary to provide a direct current loop in order to hold certain exchange apparatus in an operated condition. Such a holding circuit is closed on the operation of contacts I08 (Fig. 6) as follows: L, choke Sc, conductor 8|, contact I08, conductor 8|, L. p

In connection with the operation of electromagnet I4 it should be noted that if a source of direct current of 110 volts is employed and an air gap of 0.6 mm. is provided for the electromagnet I4 the resistance of the winding being 1000 ohms (by using'a wire of 0.1 mm. diameter) and that of resistance R5000 being 5000 ohms, it will follow that the holding current, which is insuficient to actuate the wheel 32 but sufficient for ensuring its holding maintenance when once operated, will be approximately milliamperes. The short circuiting of the resistance would decrease the current to approximately 110 milliamperes which is sufiicient instantaneously to overcome the air gap mentioned above and cause the actuating of the wheel.

It will be noticed that by manipulating a knob 24 co-operating with' wheel 24 it is possible to reduce or to prolong the time of operation of the apparatus as indeed this wheel 24 controls the different circuits.

I claim:

1. In an apparatus of the type described, the combination comprising a transmitting-recording member and a cooperating contact element adapted to be relatively displaced, and driving ing member and a cooperating contact element adapted to be relatively displaced, and driving means therefor including an electromagnetic clutch comprising an electromagnet and an armature, means for energizing the electromagnet to effect the attraction of the armature, means for reducing the energization of the electromagnet to effect a retention of the attracted armature but insufficient to attract the armature when displaced, and means actuated by the contact element for effecting the actuation of said last mentioned means.

3. In an apparatus of the type described, the combination comprising a cylindrical transmitting-recording member and a cooperating contact element movable axially of the cylinder and driving means therefor comprising an electromagnetic clutch including an electromagnet, an armature, means for energizing the electromagnet to attract and hold the armature, means for reducing the energization of the electromagnet to effect a retention of the attracted armature but insufficient to couple the elements of the clutch or attract the armature when displaced, and means for effecting the actuation of the last mentioned means.

4. In an apparatus of the type described, the combination comprising a transmitting-recording member, a co-operating stylus adapted to be displaced relative to the transmitting-recording member, a motor for driving the same, an electromagnetic clutch for connecting the stylus for actuation by the motor including an electromagnet and an armature, a clutching circuit for the electromagnet including a branch circuit having a resistance therein, the resistance being such as to permit a current flow suilicient to energize the clutch to retain the attracted armature but insufficient to attract the armature when displaced, means for energizing the clutch through the resistance, .means for short-circuiting the resistance to effect full energization of the clutch to attract the armature and cause the stylus to be displaced, and means for effecting the deenergization of the clutch.

5. In an apparatus of the type described, the combination comprising a transmitting-recording member, a co-operating stylus adapted to be displaced relative to the transmitting-recording member, a motor for driving the same, an electromagnetic clutch for connecting the stylus for actuation by the motor including an electromagnet and an armature, a clutching circuit for the electromagnet including a branch circuit having a resistance therein, the resistance'being such as to permit a current flow suflicient to energize the clutch to retain the attracted armature but insufiicient to attract the armature when displaced, means for efiecting energization of the clutch through the resistance, a switch for shortcombination comprising a transmitting-recording member, a cooperating stylus adapted to be displaced relative to the transmitting-recording member, a motor for driving the same, an electromagnetic clutch for connecting the stylus for actuation by the motor including an electromagnet and an armature, a clutching circuit for the electromagnet including a branch circuit having a resistance therein, the resistance being such as to permit a current flow sufilcient to energize the clutch to retain the attracted armature but insuflicient to attract the armature when displaced, means for effecting energization of the clutch through the resistance, a switch for short-circuiting the resistance, another switch for efiecting electrical impulses in the circuit and means for simultaneously closing the switches including 1 a rotating shaft and a wheel on the shaft.

'7. In an apparatus of the type described, the combination comprising a transmitting-recording member, a cooperating stylus adapted to be displaced relative to the transmitting-recording member, a motor for driving the same, an elec tromagnetic clutch for connecting the stylus for actuation by the motor including an electromagnet and an armature, a clutching circuit for the electromagnet including a branch circuit having a resistance therein, the resistance being such as to permit a current flow suiiicient to energize the clutch to retain the attracted armature but insuflicient to attract the armature when displaced, means ior eifecting energization of the clutch through the resistance, a switch for shortcircuiting the resistance, another switch for effecting electrical impulses in the circuit and means for simultaneously closing the switches and means actuated by the stylus for opening the clutching circuit to eiiect deenergization of the clutch.

8. In an apparatus of the type described, the combination comprising a transmitting-recording member, a cooperating stylus adapted to be displaced relative to the transmitting-recording member, a motor for driving the same, an electromagnetic clutch for connecting the stylus for actuation by the motor including an electromagnet and an armature, a clutching circuit for the electromagnet including a branch circuit having a resistance therein, the resistance being such as to permit a current flow suiiicient to energize the clutch to retain the attracted armature but insuflicient to attract the armature when displaced, means for effecting energization of the clutch through the resistance, a switch for short-circuiting the resistance, another switch for effecting electrical impulses in the circuit, means for intermittently actuating said switches simultaneously, and means actuated by the stylus for effecting deenergizatlon of the clutching circuit.

GEORGES DELCHEF. 

